Mounting lifting appliance for bridge floor steel bottom plate between steel truss girder sections of plate-truss structure and construction process

Abstract

The invention discloses a lifting appliance for mounting a bridge floor steel bottom plate between steel truss girder sections of a plate-truss structure and a construction process. Characterized in that; the lifting appliance is composed of a main beam, a connecting plate, supporting legs, inclined struts, walking wheels, rails and lifting lugs. The rated lifting weight of the device is 5 t. The lower ends of the supporting legs are provided with walking wheels and arranged on a rail, the upper ends of the inclined struts are connected with a connecting plate at the lower end of the main beam, and the lower ends of the inclined struts are fixed to the corresponding supporting legs. The mounting efficiency and precision of the steel bottom plate between the steel truss girder sections are improved through the movable bridge floor steel bottom plate mounting lifting appliance. The method has the following beneficial effects that (1) the bridge deck slab is integrally and rapidly installed, and the installation efficiency of the bridge deck slab is improved; (2) the construction safety risk on the steel truss girder is reduced through the quick installation of the bridge deck slab; the support is simple in structure, easy to machine and convenient to operate.

Description

Technical Field

[0001] The invention relates to the field of plate truss structure steel truss girder segment construction, and in particular to a bridge deck steel bottom plate installation hanger between plate truss structure steel truss girder segments and a construction process. Background Art

[0002] In the field of bridge construction, with the continuous development of technology, plate truss structure steel trusses have been widely used. In the installation of the steel bottom plate of the bridge deck between the segments of the steel truss, the traditional installation method has many disadvantages.

[0003] In the past, construction teams often relied on large-scale lifting equipment to lift and install steel base plates. However, large-scale lifting equipment is not only expensive to rent, but also has limited mobility in some complex bridge site environments, making it difficult to accurately lift the steel base plate to the designated location. For example, in mountain bridge construction, the site is narrow and the terrain is undulating. The entry, positioning and operation of large-scale lifting equipment are faced with many difficulties, resulting in low construction efficiency and increased risk of construction delays.

[0004] At the same time, the traditional installation method does not have enough control over the lifting process of the steel bottom plate. During the lifting, moving and lowering steps, it is easy to cause the steel bottom plate to collide with the steel truss structure due to shaking and inaccurate positioning, damaging the components and affecting the quality of the project. In addition, due to the lack of efficient tools specifically for the installation of steel bottom plates between steel truss segments of plate truss structures, construction workers often need to spend a lot of physical strength and time on repetitive adjustment operations, which is labor-intensive and wastes human resources seriously. Summary of the invention

[0005] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a bridge deck steel bottom plate installation hoist and construction process between steel truss girder segments of a plate truss structure; the installation efficiency and accuracy of the steel bottom plate between steel truss girder segments are solved by a mobile bridge deck steel bottom plate installation hoist.

[0006] The present invention is achieved by constructing a lifting device for installing the steel bottom plate of the bridge deck between the segments of the steel truss beam of the plate truss structure, which is characterized by: the lifting device is composed of a main beam, a connecting plate, a support leg, a diagonal brace, a running wheel, a track, and a lifting lug, and the rated lifting weight of the device is 5t; a lifting lug is fixed under the main beam, a running wheel is installed at the lower end of the support leg and is placed on the track, the upper end of the diagonal brace is connected to the connecting plate at the lower end of the main beam, and the lower end of the diagonal brace is fixed to the corresponding support leg.

[0007] According to the present invention, a bridge deck steel bottom plate installation hanger between plate truss structure steel truss beam segments is characterized in that the main beam adopts 340cm long I-14 I-beam, the connecting plate has the dimensions of 40cm long × 20cm wide × 1cm thick steel plate, the support leg height is 100cm, 8# channel steel is adopted, the diagonal brace adopts 20mm×20mm×3mm square steel pipe, the track length is 7m, and 8# channel steel is adopted.

[0008] A construction process for installing a hanger for a bridge deck steel bottom plate between segments of a plate truss structure steel truss beam, characterized in that the construction process flow is as follows: (1) Ground processing of hoisting equipment: Two mobile hoists are required to complete the installation of the bridge deck between segments. The rods are processed on the ground according to the design dimensions of the hoisting equipment drawings. Before the steel truss is hoisted, the rods are firmly tied to the steel truss bridge deck with iron wires. The rods are hoisted onto the bridge deck along with the steel truss. (2) Assembly of steel trusses and placement of steel bottom plates between segments: Steel trusses are assembled from bottom to top, first assembling the lower chord, then the web members, then the upper chord, and then installing the welded upper bridge deck of the segment. Finally, the steel bottom plates between segments are placed on the assembled segments. (3) Lifting the steel bottom plate: first place the 8# channel steel track on the small longitudinal beam, and the track does not need to be welded; move the lifting device to the storage position of the steel bottom plate between the segments, and use the lifting lugs of the lifting device to install 4 hand chain hoists, and the other end of the hand chain hoists is connected to the round hole on the stiffening rib of the steel bottom plate; tighten the hand chain hoists to lift the steel bottom plate, which is about 15 cm higher than the installed steel bottom plate; (4) Travel of the hoist: After the two frames are hoisted into place, the horizontal connecting rods are connected from bottom to top; (5) Lowering the steel base plate into position: When the steel base plate is moved and aligned with the upper chord of the steel truss beam and the designed position of the small longitudinal beam, first loosen the four hand winches at the same time until the height difference between the steel base plate and the main beam is 10 cm. First loosen the two hand winches on one side of the hoist to the designed position.

[0009] The present invention has the following advantages: it provides a patented beneficial effect of a bridge deck steel bottom plate installation hanger between steel truss beam segments of a plate truss structure; 1. Improve installation efficiency Convenient mobility: The spreader is equipped with running wheels 5 and tracks. The running wheels are installed at the lower end of the legs 3 and can move smoothly on the tracks 6. This design allows the spreader to quickly and flexibly move between steel truss segments without the need for complex lifting equipment repositioning, greatly reducing the transfer time of the spreader between different work points, thereby significantly improving the installation efficiency of the steel base plate. For example, when installing the steel base plate between multiple segments, the spreader can quickly move along the track to the next installation position and quickly carry out the lifting operation, which greatly shortens the construction period compared to traditional fixed-position spreaders or equipment that requires multiple lifting and transfers.

[0010] Efficient lifting and positioning method: The lifting device realizes the lifting of the steel base plate through the cooperation of the lifting lug and the hand chain hoist. During the lifting process, the four hand chain hoists are connected to the round holes on the stiffening ribs of the steel base plate, which can evenly apply force to make the steel base plate rise smoothly. The lifting height of about 15cm higher than the installed steel base plate is reasonably designed, which is convenient for subsequent moving operations and reduces unnecessary height adjustment time. Moreover, when the steel base plate is lowered in place, the hand chain hoists are gradually relaxed by precise operation. First, they are relaxed at the same time until the height difference between the steel base plate and the main beam is 10cm, and then the two hand chain hoists on one side of the lifting device are relaxed to the designed position. The steel base plate can be placed in the designated position quickly and accurately, avoiding the time waste of repeated adjustments and further improving the installation efficiency.

[0011] 2. Improve installation accuracy Stable structural design: The sling is composed of a reasonable structural system consisting of a main beam, a connecting plate, outriggers, and diagonal braces. The main beam is made of 340cm long I-14 I-beam, which has sufficient strength and rigidity to bear the weight of the steel base plate and ensure the stability of the lifting process. The connection method of the connecting plate, diagonal braces and outriggers forms a stable triangular support structure, which effectively prevents the sling from deformation or shaking during lifting and moving, thereby providing a solid foundation for the precise installation of the steel base plate. For example, during the lifting and moving of the steel base plate, the stable sling structure can ensure that the steel base plate always remains horizontal, avoiding the tilt of the steel base plate due to the deformation of the sling and affecting the installation accuracy.

[0012] Accurate construction process: The construction process of the hoist plays a key role in ensuring the installation accuracy. From the processing of the hoist on the ground, each rod is strictly processed according to the design size, and is hoisted to the bridge deck with the steel truss through a reasonable bundling method, to the assembly of the steel truss and the placement of the steel bottom plate between the segments, the precise assembly and placement are carried out in a specific order, and then to the fine operation steps in the process of lifting, moving and lowering the steel bottom plate into place. Each link has been carefully designed and strictly controlled. This precise construction process enables the steel bottom plate to accurately align with the upper chord of the steel truss beam and the design position of the small longitudinal beam during the installation process, effectively reducing the installation error caused by non-standard construction technology and greatly improving the installation accuracy of the steel bottom plate.

[0013] 3. Good versatility and economy Strong versatility: The design structure and construction process of the hoist are suitable for the installation of steel bottom plates between steel truss girder segments of plate truss structures. For steel truss girder segments of different sizes and specifications, as long as they are within the rated lifting weight range of 5t, through appropriate track laying and hoist positioning adjustment, the steel bottom plate installation operation can be effectively carried out. This versatility allows the hoist to be widely used in a variety of similar projects, reducing the cost and time of developing different hoists for different projects.

[0014] Significant economic efficiency: The slings are made of common steel materials such as I-14 I-beam, 8# channel steel, 20mm×20mm×3mm square steel pipe, etc. The material cost is relatively low and easy to obtain. At the same time, because it can improve the installation efficiency and accuracy, it reduces the manpower, material and time costs in the construction process. For example, the shortened construction period due to the improved installation efficiency can reduce the equipment rental cost and personnel management cost of the project; the improved installation accuracy reduces the material waste and rework cost caused by errors, which reflects good economic efficiency from many aspects and provides strong support for the cost control and economic benefit improvement of engineering projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the segment installation plan layout; Figure 2 Main beam standard section diagram; Figure 3 Structural drawing of steel base plate and stiffening ribs; Figure 4 Steel base plate product structure diagram; Figure 5 Single spreader construction diagram; Figure 6 Construction process flow chart. DETAILED DESCRIPTION

[0016] The following will be combined with the attached Figure 1-Figure 6 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention provides a bridge deck steel bottom plate installation hoist between steel truss beam segments of a plate truss structure, and solves the problem of installation efficiency and accuracy of steel bottom plates between steel truss beam segments through a mobile bridge deck steel bottom plate installation hoist. As shown in the figure, it can be implemented in the following manner; the hoist consists of a main beam 1, a connecting plate 2, a support leg 3, a diagonal brace 4, a running wheel 5, a track 6, and a lifting lug 7. The rated lifting weight of the device is 5t. A lifting lug 7 is fixed under the main beam 1, a running wheel 5 is installed at the lower end of the support leg 3 and is placed on the track 6, the upper end of the diagonal brace 4 is connected to the connecting plate 2 at the lower end of the main beam 1, and the lower end of the diagonal brace 4 is fixed to the corresponding support leg 3.

[0018] When the present invention is implemented, the main beam 1 adopts 340cm long I-14 I-steel, the connecting plate 2 has the dimensions of 40cm long×20cm wide×1cm thick steel plate, the support leg 3 has a height of 100cm and adopts 8# channel steel, the diagonal brace 4 adopts 20mm×20mm×3mm square steel pipe, and the track 6 has a length of 7m and adopts 8# channel steel.

[0019] The construction process of a hanger for installing a steel bottom plate of a bridge deck between steel truss beam segments of a plate truss structure is as follows: (1) Ground processing of hoisting equipment: Two mobile hoists are required to complete the installation of the bridge deck between segments. The rods are processed on the ground according to the design dimensions of the hoisting equipment drawings. Before the steel truss is hoisted, the rods are firmly tied to the steel truss bridge deck with iron wires. The rods are hoisted onto the bridge deck along with the steel truss. (2) Assembly of steel trusses and placement of steel bottom plates between segments: Steel trusses are assembled from bottom to top, first assembling the lower chord, then the web members, then the upper chord, and then installing the welded upper bridge deck of the segment. Finally, the steel bottom plates between segments are placed on the assembled segments. (3) Lifting the steel bottom plate: first place the 8# channel steel track on the small longitudinal beam, and the track does not need to be welded; move the lifting device to the storage position of the steel bottom plate between the segments, and use the lifting lugs of the lifting device to install 4 hand chain hoists, and the other end of the hand chain hoists is connected to the round hole on the stiffening rib of the steel bottom plate; tighten the hand chain hoists to lift the steel bottom plate, which is about 15 cm higher than the installed steel bottom plate; (4) Travel of the hoist: After the two frames are hoisted into place, the horizontal connecting rods are connected from bottom to top; (5) Lowering the steel base plate into position: When the steel base plate is moved and aligned with the upper chord of the steel truss beam and the designed position of the small longitudinal beam, first loosen the four hand winches at the same time until the height difference between the steel base plate and the main beam is 10 cm. First loosen the two hand winches on one side of the hoist to the designed position.

[0020] The specific implementation of this application is described in detail below with reference to the accompanying drawings. The product structure is as follows: Figure 4 Steel base plate product structure diagram; The traveling hoist consists of a main beam 1, a connecting plate 2, a leg 3, a diagonal brace 4, a traveling wheel 5, a track 6, and a lifting lug 7. The rated lifting capacity of the device is 5t. Structural construction: The main beam is made of 340cm long I-14 I-beam, the connecting plate is 40cm long × 20cm wide × 1cm thick steel plate, the leg height is 100cm, and 8# channel steel is used, the diagonal brace is 20mm × 20mm × 3mm square steel pipe, and the track length is 7m, and 8# channel steel is used. Figure 5 Single spreader construction diagram. Figure 6 Construction process flow chart, construction process flow: (1) Floor processing of hoisting equipment: Two mobile hoists are required to complete the installation of the bridge deck between segments. Each rod is processed on the ground according to the design dimensions of the hoist drawing. Before the steel truss is hoisted, the rod is firmly tied to the steel truss bridge deck with iron wire, and the rod is hoisted to the bridge deck along with the steel truss.

[0021] (2) Assembly of steel trusses and placement of steel bottom plates between segments The steel truss is assembled from bottom to top, first assembling the lower chord, then the web, then the upper chord, and then installing the welded segment upper bridge deck, and finally placing the steel bottom plate between segments on the assembled segments.

[0022] (3) Lifting of steel base plate First, place the 8# channel steel track on the small longitudinal beam. The track does not need to be welded. Move the hoist to the storage position of the steel bottom plate between the segments, and use the hoist lugs to install 4 hand chain hoists. The other end of the hand chain hoist is connected to the round hole on the stiffening rib of the steel bottom plate. Tighten the hand chain hoist to lift the steel bottom plate, about 15cm higher than the installed steel bottom plate.

[0023] (4) Travel of the hoist After the two frames are hoisted into place, the horizontal connecting rods are connected from bottom to top.

[0024] (5) The steel base plate is lowered into place.

[0025] When the steel base plate moves and aligns with the designed position of the upper chord of the steel truss crossbeam and the small longitudinal beam, first loosen the four hand hoists at the same time until the height difference between the steel base plate and the main beam is 10cm, and first loosen the two hand hoists on one side of the hoist to the designed position.

[0026] The present invention has the following beneficial effects: (1) The overall rapid installation of the bridge deck improves the efficiency of bridge deck installation.

[0027] (2) Rapid installation of bridge deck reduces safety risks.

[0028] (3) The bracket has a simple structure, is easy to process and easy to operate.

[0029] The stiffening beam of a suspension bridge mainly supports and transfers loads, and is the main component that bears wind loads and other lateral horizontal forces. The stiffening beams of large-span suspension bridges are mostly made of steel structures, generally truss beams and flat steel box beams. The present invention is suitable for the installation between segments of the steel bottom plate of a truss beam bridge deck. The installation of the steel bottom plate of a plate-truss structure bridge deck is divided into two stages: on the segment and between the segments. The first stage is the installation of the steel bottom plate of the bridge deck on the segment. The steel bottom plate of the bridge deck on the segment is installed on the ground and welded to the steel truss beam as a whole. The cable hoist system is used to hoist the steel bottom plate between the segments. The steel bottom plate between the segments is placed on the segment steel bottom plate; the second stage is the installation of the steel bottom plate between the segments. The installation of the steel bottom plate between the segments needs to be installed on the steel truss beam of the bridge deck after the adjacent segments have just been connected.

[0030] Sichuan Kahalo Jinsha River Bridge is a steel truss suspension bridge with a main span of 1,030 meters. The main beam segment length is divided into 72 standard segments and 3 non-standard segments. The main beam is composed of a main truss, a cross beam, an upper longitudinal beam, and a lower plane connection system; the cross beam is composed of an upper chord, a lower chord, and diagonal webs on both sides. The standard length of the main beam in the longitudinal direction of the bridge is 6.9m. There are 9 small longitudinal beams with a spacing of 3.1m in the transverse direction of the bridge. The 8 bridge deck steel bottom plates are welded with the main beam and the small longitudinal beams to form a plate truss structure. Figure 1 , Figure 2 .

[0031] The main bridge deck itself adopts a steel-concrete composite structure. The bridge deck steel bottom plate is 9600mm long × 3100mm wide × 10mm thick. The steel bottom plate is transversely welded with perforated stiffening ribs with a longitudinal spacing of 400mm; the perforated rib height is 98mm, with transverse holes of 40mm and a spacing of 100mm; the steel bottom plate of the bridge deck is welded to the upper longitudinal beam of the main beam, the upper chord of the main truss, and the upper chord of the cross beam to form a whole, realizing the combination of plate and truss, the bridge deck is strongly supported, the main beam has a strong upper flat connection, and then the transverse structural system of the main beam is simplified, such as Figure 3 .

[0032] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bridge deck steel bottom plate installation hanger between steel truss beam segments of a plate truss structure, characterized in that; The hoist consists of a main beam, a connecting plate, legs, diagonal braces, traveling wheels, tracks and lifting ears. The rated lifting capacity of this device is 5t. A lifting ear is fixed under the main beam, a traveling wheel is installed at the lower end of the leg and placed on the track, the upper end of the diagonal brace is connected to the connecting plate at the lower end of the main beam, and the lower end of the diagonal brace is fixed to the corresponding leg.

2. The installation hanger for the bridge deck steel bottom plate between the plate truss structure steel truss beam segments according to claim 1, characterized in that; The main beam is made of 340cm long I-14 I-beam, the connecting plate size is 40cm long × 20cm wide × 1cm thick steel plate, the support leg height is 100cm, 8# channel steel is used, the diagonal brace is made of 20mm×20mm×3mm square steel pipe, the track length is 7m, and 8# channel steel is used.

3. A construction process for installing a hanger for a bridge deck steel bottom plate between segments of a plate truss structure steel truss, characterized in that; The construction process is: (1) Ground processing of hoisting equipment: Two mobile hoists are required to complete the installation of the bridge deck between segments. The rods are processed on the ground according to the design dimensions of the hoisting equipment drawings. Before the steel truss is hoisted, the rods are firmly tied to the steel truss bridge deck with iron wires. The rods are hoisted onto the bridge deck along with the steel truss. (2) Assembly of steel trusses and placement of steel bottom plates between segments: Steel trusses are assembled from bottom to top, first assembling the lower chord, then the web members, then the upper chord, and then installing the welded upper bridge deck of the segment. Finally, the steel bottom plates between segments are placed on the assembled segments. (3) Lifting the steel bottom plate: first place the 8# channel steel track on the small longitudinal beam, and the track does not need to be welded; move the lifting device to the storage position of the steel bottom plate between the segments, and use the lifting lugs of the lifting device to install 4 hand chain hoists, and the other end of the hand chain hoists is connected to the round hole on the stiffening rib of the steel bottom plate; tighten the hand chain hoists to lift the steel bottom plate, which is about 15 cm higher than the installed steel bottom plate; (4) Travel of the spreader: Gently push the spreader to allow it to travel along the track and move the steel base plate to the location to be installed; (5) Lowering the steel base plate into position: When the steel base plate is moved and aligned with the upper chord of the steel truss beam and the designed position of the small longitudinal beam, first loosen the four hand winches at the same time until the height difference between the steel base plate and the main beam is 10 cm. First loosen the two hand winches on one side of the hoist to the designed position.

Images